作 者：
林建平;邓爱珍;赵小敏;江叶枫;韩逸;谢雨
关键词：
耕地土壤养分;高程;空间变异;方差分析;南方丘陵山区
摘 要：
为探讨不同高程下的耕地土壤养分空间变异特征,选择南方典型丘陵山地区-江西省赣州市为研究区,基于2012-2013年测土配方项目不同高程下采集处理的2 928个耕层(0~20 cm)土壤养分数据,运用经典统计、相关性分析、方差分析和协同克里格差值方法,分析了耕地土壤养分含量与高程的空间耦合关系.结果表明:土壤有机质、全氮、全钾含量与高程呈正相关关系,全磷、有效磷含量与高程呈负相关关系,速效钾含量与高程相关性不显著.高程分组方差分析结果进一步显示,在小于250 m高程范围内,有机质和全氮含量随高程上升而增加,高值区主要分布在研究区周边海拔较高地区,当高程大于250 m时,养分含量变化差异不显著;在小于200 m高程范围内,全磷和有效磷含量随高程上升而降低,高值区主要分布在研究区中部低海拔地区,当高程大于200 m时,养分含量变化差异不显著;全钾含量随高程上升而增加,但有效钾含量随高程变化波动较大,二者规律性不明显.土壤养分含量随高程变化是不同高程下的成土母质、土壤类型、土地利用方式、土壤侵蚀等共同作用的结果.研究结果有助于探明耕地土壤养分随高程垂直变化规律,对实现土壤养分的精准管理和保障我国粮食安全具有重要意义.
作 者：
LIN Jianping;DENG Aizhen;ZHAO Xiaomin;JIANG Yefeng;HAN Yi;XIE Yu;College of Forestry,Jiangxi Agricultural University;Key Laboratory of Poyang Lake Basin Agricultural Resources and Ecology,Jiangxi Province,Jiangxi Agricultural University;Department of Surveying and Geo-Informatics,Jiangxi College of Applied Technology;
关键词：
soil nutrients of cultivated land;;elevation;;spatial variation;;variance analysis;;hilly areas of southern mountains
摘 要：
In order to investigate the variation characteristics of soil nutrients of cultivated land in different elevation fields,a typical south hilly area—Ganzhou City of Jiangxi Province was selected as research case. Based on the data of totally 2 928 soil nutrient samples collected in the topsoil layer( 0 ～20 cm) of the farmlands at different altitudes in 2012—2013,classical statistical analysis,variance analysis and co-Kriging method were employed to analyze the spatial coupling relation between soil nutrients of cultivated land and different elevations. The result showed that the correlation relationship between soil organic matter( SOM),total nitrogen( TN),total potassium( TK) and elevation were overwhelmingly positive. Meanwhile, there was a remarkable negative correlation between total phosphorus( TP),available phosphorus( AP) and elevation. However,altitude was irrelevant to available potassium( AK). According to the variance analysis of soil nutrients,the content of SOM and TN was increased with the rise of elevation when the elevation was below 250 m. But the changes of soil nutrient content became inapparent above 250 m. The spatial distribution map showed clearly that high value area was mainly distributed in area of high elevation around the research area. On the other side,the content of TP and AP was decreased with the rise of elevation when the elevation was below 200 m.High value area was mainly distributed in area of middle and low elevation around the research area according to the spatial distribution map. Likewise,the changes of soil nutrient content were not significant above 200 m. TK content was increased with elevation,however,the content of AK was fluctuated greatly. Yet their pattern was inapparent. The spatial variation of soil nutrients was due to the interaction of parent materials,soil types,land use patterns and soil erosion at different elevations. The research results could help to find out the vertical changing law of soil nutrients at different elevations,which was of great significance for ensuring grain security of China.
